Finding the Fourth Proportional to 12,696.89, 17,521.40 and 7,031.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,696.89 : 17,521.40 = 7,031.28 : x
2. Step 2: Convert to fraction form
   12,696.89/17,521.40 = 7,031.28/x
3. Step 3: Cross multiply
   12,696.89x = 17,521.40 × 7,031.28
4. Step 4: Simplify right side
   12,696.89x = 123,197,886.97
5. Step 5: Solve for x
   x = 123,197,886.97/12,696.89
6. Step 6: Final answer
   x = 9,703.00